Ok it can go down a curb, but can it go up? I'd like to see that attempted.
Also, what would happen if/when the stairs are not of exactly the correct spacing and dimensions? A quick mental visualation can picture a step set-up that would clear the front wheel but beach and foul the frame as the back section 'receded'.
Totaly cool/interesting tech demo tho and on a flat surface the ride was a whole lot smoother than I pictured prior to watching the yt clip